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Chemistry of crown ethers XVIII. Isolation and purification of 18-crown-6 by selective complexation with non-ionic compounds

✍ Scribed by A. van Zon; F. de Jong; D. N. Reinhoudt; G. J. Torny; Y. Onwezen

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
694 KB
Volume
100
Category
Article
ISSN
0165-0513

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✦ Synopsis

Abstract

A number of non‐ionic compounds have been found to form solid complexes with 18‐crown‐6. The highest efficiencies of isolation and the highest selectivities were obtained with nitromethane, dimethyl carbonate and dimethyl oxalate. The usefulness of these compounds was demonstrated in the isolation of >98% pure 18‐crown‐6 from crude reaction mixtures.

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## Abstract A safe, efficient and selective method has been developed for the isolation and purification of crown ethers to replace the conventional procedure, which involves repeated vacuum distillations and has reportedly led to destructive explosions. The method is based on the formation of an i